WAEC - Physics (2013 - No. 24)
The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface
19o
21o
39o
42o
Forklaring
Sin C = \(\frac{1}{\eta} = \frac{1}{1.5} = 0.6667\)
C = sin\(^{-1}\) 0.6667
= 42°
C = sin\(^{-1}\) 0.6667
= 42°